bullshit is a common English slang term that can be used as a noun, verb, or interjection.
As a noun, it refers to:
1. Nonsense or false statements
2. Exaggerated or misleading talk
3. Something worthless or ridiculous
As a verb, it means:
1. To lie or deceive
2. To talk nonsense
3. To exaggerate or mislead
As an interjection, it expresses:
1. Disbelief or skepticism
2. Dismissal of something as untrue